Solar cell



FIG. 1 is a top perspective view of the first embodiment of a solar cellshowing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a back side view thereof; and

FIG. 7 is a front side view thereof.

FIG. 8 is a top perspective view of the second embodiment of a solarcell showing our new design;

FIG. 9 is a top view thereof;

FIG. 10 is a bottom view thereof;

FIG. 11 is a right side view thereof;

FIG. 12 is a left side view thereof;

FIG. 13 is a back side view thereof; and,

FIG. 14 is a front side view thereof.

The broken lines shown represent the portions of the solar cell whichform no part of the claimed design.

CLAIM The ornamental design for a solar cell, as shown and described.